1. (20 pts) Create an ER diagram for the following situation:

We want to model information about books. The only entity type allowed is book, and everything else needs to be modeled as an attribute.

For each book, we keep their ISBN (Identifier), their title, one or more authors, and a format.

The book's format is further subdivided into: type of binding, number of pages, dimensions and weight.

The weight can be calculated from the other attributes of the format.